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[PATCH] md: provide proper rcu_dereference / rcu_assign_pointer annotations in md

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Acked-by: <paulmck@us.ibm.com>
Signed-off-by: Suzanne Wood <suzannew@cs.pdx.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Suzanne Wood
2005-11-08 21:39:27 -08:00
committed by Linus Torvalds
parent 9d88883e68
commit d6065f7bf8
5 changed files with 38 additions and 36 deletions
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20
drivers/md/raid1.c
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@@ -416,10 +416,10 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
/* Choose the first operation device, for consistancy */
new_disk = 0;
for (rdev = conf->mirrors[new_disk].rdev;
for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
!rdev || !rdev->in_sync
|| test_bit(WriteMostly, &rdev->flags);
rdev = conf->mirrors[++new_disk].rdev) {
rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) {
if (rdev && rdev->in_sync)
wonly_disk = new_disk;
@@ -434,10 +434,10 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
/* make sure the disk is operational */
for (rdev = conf->mirrors[new_disk].rdev;
for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
!rdev || !rdev->in_sync ||
test_bit(WriteMostly, &rdev->flags);
rdev = conf->mirrors[new_disk].rdev) {
rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) {
if (rdev && rdev->in_sync)
wonly_disk = new_disk;
@@ -474,7 +474,7 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
disk = conf->raid_disks;
disk--;
rdev = conf->mirrors[disk].rdev;
rdev = rcu_dereference(conf->mirrors[disk].rdev);
if (!rdev ||
!rdev->in_sync ||
@@ -496,7 +496,7 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
if (new_disk >= 0) {
rdev = conf->mirrors[new_disk].rdev;
rdev = rcu_dereference(conf->mirrors[new_disk].rdev);
if (!rdev)
goto retry;
atomic_inc(&rdev->nr_pending);
@@ -522,7 +522,7 @@ static void unplug_slaves(mddev_t *mddev)
rcu_read_lock();
for (i=0; i<mddev->raid_disks; i++) {
mdk_rdev_t *rdev = conf->mirrors[i].rdev;
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !rdev->faulty && atomic_read(&rdev->nr_pending)) {
request_queue_t *r_queue = bdev_get_queue(rdev->bdev);
@@ -556,7 +556,7 @@ static int raid1_issue_flush(request_queue_t *q, struct gendisk *disk,
rcu_read_lock();
for (i=0; i<mddev->raid_disks && ret == 0; i++) {
mdk_rdev_t *rdev = conf->mirrors[i].rdev;
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !rdev->faulty) {
struct block_device *bdev = rdev->bdev;
request_queue_t *r_queue = bdev_get_queue(bdev);
@@ -728,7 +728,7 @@ static int make_request(request_queue_t *q, struct bio * bio)
#endif
rcu_read_lock();
for (i = 0; i < disks; i++) {
if ((rdev=conf->mirrors[i].rdev) != NULL &&
if ((rdev=rcu_dereference(conf->mirrors[i].rdev)) != NULL &&
!rdev->faulty) {
atomic_inc(&rdev->nr_pending);
if (rdev->faulty) {
@@ -954,7 +954,7 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
found = 1;
if (rdev->saved_raid_disk != mirror)
conf->fullsync = 1;
p->rdev = rdev;
rcu_assign_pointer(p->rdev, rdev);
break;
}